The present invention relates to a vinyl chloride polymer and a production method thereof. More specifically, the present invention provides a vinyl chloride polymer having a polydispersity index of 2.0 to 2.3 and a porosity of 60% or greater and a production method thereof in which a vinyl chloride polymerization seed having a conversion rate of 5-20% is first prepared through preliminary polymerization and then a vinyl chloride monomer is introduced into the vinyl chloride polymerization seed to polymerize (main polymerization) a vinyl chloride polymer.

The present invention relates to a vinyl chloride polymer and a production method thereof. More specifically, the present invention provides a vinyl chloride polymer having a polydispersity index of 2.0 to 2.3 and a porosity of 60% or greater and a production method thereof in which a vinyl chloride polymerization seed having a conversion rate of 5-20% is first prepared through preliminary polymerization and then a vinyl chloride monomer is introduced into the vinyl chloride polymerization seed to polymerize (main polymerization) a vinyl chloride polymer.

The present invention pertains to: a batch-type suspension polymerization stirrer for producing polyvinyl chloride; and a batch-type suspension polymerization reactor using same. More specifically, the present invention pertains to a batch-type exothermic reactor for performing vinyl chloride polymerization while controlling the internal temperature of an exothermic reaction chamber. Even more specifically, the present invention pertains to an invention wherein the structure of a reflux condenser among jacket, baffle, and reflux condenser devices responsible for heat removal in a reactor is designed to improve productivity and polymerization efficiency.

The present invention pertains to: a batch-type suspension polymerization stirrer for producing polyvinyl chloride; and a batch-type suspension polymerization reactor using same. More specifically, the present invention pertains to a batch-type exothermic reactor for performing vinyl chloride polymerization while controlling the internal temperature of an exothermic reaction chamber. Even more specifically, the present invention pertains to an invention wherein the structure of a reflux condenser among jacket, baffle, and reflux condenser devices responsible for heat removal in a reactor is designed to improve productivity and polymerization efficiency.

The present invention relates to a plasticizer composition which includes a terephthalate-based plasticizer and a trimellitate-based plasticizer, selectively includes a citrate-based plasticizer, and does not contain epoxidized oil, and particularly, a plasticizer composition capable of improving physical properties including migration resistance, tensile strength, elongation rate, retention characteristics and low-temperature resistance, required for use as a plasticizer of a resin composition, by improving the problems associated with a conventional plasticizer; and a resin composition including the same.

The present invention relates to a plasticizer composition which includes a terephthalate-based plasticizer and a trimellitate-based plasticizer, selectively includes a citrate-based plasticizer, and does not contain epoxidized oil, and particularly, a plasticizer composition capable of improving physical properties including migration resistance, tensile strength, elongation rate, retention characteristics and low-temperature resistance, required for use as a plasticizer of a resin composition, by improving the problems associated with a conventional plasticizer; and a resin composition including the same.

An object of the present invention is to provide a PVA-based resin having a small distribution in degree of heat treatment in which the degree of heat treatment does not depend on a particle diameter. The polyvinyl alcohol-based resin of the present invention has an absorbance at 280 nm of 0.3 or more when being made to a 0.1 wt % aqueous solution and satisfies the following Formula (1): 0.9≤X.sub.1/Y.sub.1≤1.2 (in Formula (1), X.sub.1 represents an absorbance at 320 nm of a 0.1 wt % aqueous solution of a polyvinyl alcohol-based resin having a particle diameter larger than 1000 μm and 1680 μm or less, and Y.sub.1 represents an absorbance at 320 nm of a 0.1 wt % aqueous solution of a polyvinyl alcohol-based resin having a particle diameter larger than 212 μm and 500 μm or less).

An object of the present invention is to provide a PVA-based resin having a small distribution in degree of heat treatment in which the degree of heat treatment does not depend on a particle diameter. The polyvinyl alcohol-based resin of the present invention has an absorbance at 280 nm of 0.3 or more when being made to a 0.1 wt % aqueous solution and satisfies the following Formula (1): 0.9≤X.sub.1/Y.sub.1≤1.2 (in Formula (1), X.sub.1 represents an absorbance at 320 nm of a 0.1 wt % aqueous solution of a polyvinyl alcohol-based resin having a particle diameter larger than 1000 μm and 1680 μm or less, and Y.sub.1 represents an absorbance at 320 nm of a 0.1 wt % aqueous solution of a polyvinyl alcohol-based resin having a particle diameter larger than 212 μm and 500 μm or less).

Provided is a vinyl chloride resin composition that can form a vinyl chloride resin molded product having excellent adhesiveness to a foamed polyurethane molded product. The vinyl chloride resin composition contains a vinyl chloride resin, a plasticizer, and a vinyl chloride-(meth)acrylate copolymer.

Provided is a vinyl chloride resin composition that can form a vinyl chloride resin molded product having excellent adhesiveness to a foamed polyurethane molded product. The vinyl chloride resin composition contains a vinyl chloride resin, a plasticizer, and a vinyl chloride-(meth)acrylate copolymer.